The difference between servo motor and stepper motor

2021-11-03 09:38:36 jact_elec

The difference between servo motor and stepper motor

Stepper motors and servo motors are common industrial electronic equipment, usually used in industrial automatic control systems. However, many people do not know how to distinguish between stepper motors and servo motors. In this article, we will share the difference between stepper motors and servo motors. Identification methods and differences.

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1. Different control methods

The stepping motor controls the rotation angle by controlling the number of pulses, and one pulse corresponds to a step angle.
The servo motor controls the rotation angle by controlling the length of the pulse time.

2. Different workflows

The working process of a stepper motor generally requires two pulses for the work of a stepper motor: signal pulse and direction pulse.The work flow of the servo motor is a power connection switch, and then the servo motor is connected.

The power required by the servo motor is a switch (relay switch or relay card) and a servo motor; its work flow is the power connection switch, and then the servo motor.

3. Different low frequency characteristics

Stepping motors are prone to low-frequency vibration at low speeds. The vibration frequency is related to the load condition and the performance of the drive. It is generally considered that the vibration frequency is half of the no-load take-off frequency of the motor. This low-frequency vibration phenomenon determined by the working principle of the stepper motor is very unfavorable to the normal operation of the machine. When the stepper motor is working at low speed, damping technology should generally be used to overcome the low-frequency vibration phenomenon, such as adding a damper to the motor, or using subdivision technology on the drive.

The AC servo motor runs very smoothly, and there is no vibration even at low speeds. The AC servo system has resonance suppression function, which can cover the lack of rigidity of the machine, and the internal frequency analysis function (FFT) of the system can detect the resonance point of the machine, which is convenient for system adjustment.

4.Different moment frequency characteristics

The output torque of the stepper motor decreases with the increase of the speed, and will drop sharply at higher speeds, so its maximum working speed is generally 300~600r/min.

The AC servo motor has a constant torque output, that is, it can output a rated torque within its rated speed (generally 2000 or 3000r/min), and a constant power output above the rated speed.

5.Different overload capacity

Stepper motors generally do not have overload capacity.

The servo motor has a strong overload capacity.

The above are five common differences between servo motors and stepper motors. JACT is a Chinese manufacturer of DC servo motors, selling high-quality servo motors. Click here to learn more.

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